EUCHNER ZSM Betriebsanleitung Seite 3

Operating Instructions Enabling Switch ZSM
Correct use
The EUCHNER enabling switch is a manually
operated command switch, which allows work to
be carried out in the danger area of automated
production systems in the manual operating mode.
This mode must be secured with a lockable selec-
tor switch according to EN 60204, part 1.
The enabling switch must be logically gated with
the machine control system in a manner that en-
sures compliance with the requirements applicable
to safety circuits according to VDI 2854 and/or
EN 775. Under the conditions specified therein,
the enabling signal may cancel the protective ac-
tion of moving safety guards. Authorized operating
personnel may then enter the danger area:
for setting up

for observing work sequences

for maintenance.

Incorrect use
The enabling signal must not be simulated by fixing
the switching element in the enabling switch.
Attachments, such as key-operated rotary switches,
buttons, etc. are not allowed to be used for
safety tasks.
The stop button on enabling switches with plug
connectors is not allowed to be used as an emer-
gency stop in accordance with IEC 60204-1.
It is only allowed to use a hard-wired electrome-
chanical emergency stop device for shutting down
in an emergency.
General
If 2-channel evaluation is used with monitoring for
same contact state, category 3 as per EN954-1
is attained.
Depending on the version, buttons, a key-operated
rotary switch, stop button, etc. can be used to
provide additional functions.
The letters on the rating plate represent the
product's year of manufacture.
Function
Stage 1: Off function, pushbutton not pressed
Stage 2: Enabling function, pushbutton pressed
to center position (actuating point)
Stage 3: Off function, pushbutton pushed to
end stop
The enabling function is cancelled by releasing the
pushbutton or pressing it beyond the actuating
point. The enabling function does not reactivate
when returning from stage 3 to stage 1.
Safety precautions
Enabling switches fulfill a personal protection
function. Incorrect use or tampering can lead to
severe injuries to personnel.
All the safet y and accident prevention
regulations for the specific application, e.g.
guidelines of the employers liability insurance
associations, safety requirements of the
VDI (EN 775, VDI 2854), EN 60204, EN 292,
EN 954, DIN VDE 0106 part 100, etc. must
be observed.
Electromechanical enabling switches/devices
are to be logically gated with the control sys-
tem in a manner that ensures compliance with
the requirements applicable to safety circuits
according to DIN EN 775, DIN EN 60204-1,
DIN EN 954-1, DIN EN 1088 and VDI 2854.
No commands for potentially hazardous condi-
tions are allowed to be initiated with enabling
switches alone.
The safety function of enabling switches must
not be bypassed (bridging of contacts), ma-
nipulated or otherwise rendered ineffective.
The enabling switch must be protected
against attempts by the operator to bypass
its function.
Enabling switches may be used only by au-
thorized persons who can recognize hazards
in time and who are able to take appropriate
action immediately.
Every person present in the danger area must
carry his/her own enabling switch on his/her
person.
Mounting
Mounting must be performed only by autho-
rized personnel.
A suitable holder must be used for enabling
switches.
Electrical connection
Electrical connection must be performed only
by authorized personnel.
In safety circuits, both contacts on the en-
abling switch must be evaluated separately
(2-channel) (Figure 1).
In the installation of a system, the cables
and wires used (except earth conductors)
that can be touched without opening or
removing a cover, or are laid on conductive
parts external to the device, must be either
double insulated or have reinforced insulation
between core and surface, or be surrounded
by a metal sheath of adequate current-carry-
ing capacity in case of a short between core
and sheath.
For use and operation as per the requirements
, a power supply with the feature "for use
in class 2 circuits" must be used.
Hazards due to crushing or cutting of the connection
cable must be prevented by suitable measures:
Protecting the cable by laying it appropriately,

e.g. in a protective sleeve.
Monitoring short circuits using an evalua-

tion unit.
Using cable with individually screened cores.

These screens are to be connected to the ma-
chine or plant earthing system. In this way cable
short circuits can be detected and the control
system shut-down immediately by the triggering
of the short circuit protection.
DC 24 V
-S1
Stufe
1 2 3
E1
GND
Figure 1: Application examples
Setup
Check the enabling switch (enabling function at
stage 2, and positively driven at stage 3) by per-
forming a functional check.
Depending on the version: check the integrated
functions, such as stop button, key-operated rotary
switch, LEDs, etc.
Service and inspection
No servicing is required, but to ensure trouble-free
long-term operation, regular inspection of the elec-
trical and mechanical function is required.
In the event of functional faults or damage,
the enabling switch must be replaced. Repairs
are only to be made by the manufacturer!
Exclusion of liability under the following
conditions:
if the unit is not used for its intended purpose

non-compliance with safety regulations

electrical connection not performed by autho-

rized personnel
non-implementation of functional checks.

Technical data
Parameter
Material
Housing
Enabling switch
Grip/seal
Degree of protection
according to IEC 529
Ambient temperature
Enabling switch switching
elements
Mechanical life
Utilization category
to IEC 947-5-1
(for enabling switch S4)
Short circuit protection
according to IEC 60269-1
Weight
Cable resistance
Conductor cross-section
Cable length
1) If the cable lengths vary, the short circuit protection must be
dimensioned accordingly and checked.
monitored
0V
A1
-
M
A1 S11
+ EUCHNER
ZS-M 09xxxx
E2 E3 24VDC
ESM-BA2xx
A2 S10 S13
+24V
Value
PA
CR
TPE
IP54
-5 ... + 60°C
3 changeover contacts
1 x 10 operating cycles
6
DC13 U 24V I 0.3A
e e
U 24V I 1A
e e
2 A gG
1)
approx. 1.1 kg
≥ 145 W / km
0.14 mm
2
5 m
Start
S21 S12 S14 13
+
K1
EUCHNER
+
K2
14
23
24